Secondary cooling element



Jan. 9, 1934. TAYLOR -r AL 1,942,458

SECONDARY COOLNG ELEMENT FledMay 16, 1931 2 Sheets-Sheet l 4 'INVENTEORY'S RSJrylar ATTORNEY Jan. 9, 1934.

R. s. TAYLOR Er AL SECONDARY cQpLING ELEMENT Filed May 1'6; 1931 2 Sheets-Sheet 2 .S R Nv? m n a e 0. v mTH U SA. .A )W RR. .A i W\ aast-.a .im o, i934 SECONDARY tion, New York, ware Application May 8 Claims.

This invention relates to refrigeration and. more particularly Vto a secondary cooling Aelement for absorption type refrigerating apparatus.

It is an object of this invention to provide a secondary cooling vsystem comprising a single element having an evaporating portion surrounding a freezing chamber and a condensing portion adapted to be arranged in heat exchange relation with the primary evaporator of a refrigerating unit.

Another object of this invention is to provide a secondary cooling element fabricated of pressed metal sheets thereby presenting finesse in appearance, ease in manufacture, and simplicity in structure.

Other objects and advantages will be apparent from the following description taken in connection with the accompanying drawings, in which Fig. 1 is a front elevation partly broken away of an evaporator contemplated by this invention;

Fig. 2, a section of the evaporator taken on line 2--2 of Fig. 1;

Fig. 3, a top view Fig. 4, a section and Fig. 5, a section taken online 5-5'in Fig. 4.

Referring to the drawings, in which like reference numerals indicate llike parts, a secondary evaporator is shown fabricated of several open end metal shells including an outer shell 10, an upper .inner shell 11', and a plurality of lower inner shells 12, 13, and 14. The primary evaporator shown in outline is part of a refrigerating4 apparatus of the absorption type. The upper inner shell 11 of the secondary evaporator is adapted to flt over the primary evaporator 15 in thermal conductive relation therewith and is shown as a metal tube adapted to fit over the cylindrical primary evaporator.

The lower inner shells 12, 13, and 14 enclose chambers 16, 17, and 18 respectively. The upper part of the shell 12 hasaconfiguration corresponding to the curvature of the shell11 and i`s slightly spaced therefrom in any manner, for instance by a series of struck-out spacing portions 26 of the shell 12 spot welded to the under side of the shell 1l as shown. The shells, 12, 13, and 14 which are substantially rectangular in cross section cooperate to form horizontal partitions or shelves 19 and 20 which are hollow and fluid tight, which is accomplished, for instance,.by corrugating the corresponding sides of the shells and welding between the corrugations and at the edges of the shells. Welding between the corrugations adds mechanical strength to the structure.

of the evaporator; taken on line 4--4 of Fig. 2;-

`instance, by corrugating COOLING ELEMENT Robert S. Taylor and Roy A. Heim,

Ind., assignors to Electrolux Servei Evansville, Corporava corporation of Dela- 1'6, 1931. Serial No. 531,862

(ci. s2-95) The assembled inner shells are surrounded by a single outer shell l0 which is pressed toa configuration corresponding 4to the outline of 'the' inner shells and slightly spaced therefrom, for

the outer shell and welding to the inner shells between the corrugations. The edges of all the shells are welded together to form a fluid tight space around the shell 11 and the chambers 16, 1'1, and 18. If the spacing corrugations are used, as shown, a plurality of chan- '65 nels encircle the shell 11 and the chambers 16, 1'?, and 18.

For ease of fabrication the corrugatons in the outer shell 10 terminate in horizontal manifolds 21 and 22`which, bled, communicate with the corrugations in that portion of the outer shell around the upper inner shell 11 through passages 23 and 24 formed by' pressing the inner shell 12. `The space around the chambers 16, 1'?, and 18 is adapted to con- 75 tain a liquid refrigerant and constitutes the evaporating portion of the secondary evaporator. The refrigerant may be introduced through a charging tube 25 which is then sealed. The space around the upper inner shell 11 constitutes the 80 condensing portion of the secondary evaporator. Heat absorbed from the chambers 16, 1'7, andli V and the surrounding medium vaporizes the refrig" erant in the evaporating portion and the refrigerant vapor is cooled and condensed in the condensing portion of the secondary evaporator by the transfer of heat to the primary evaporator and flows back to the evaporating ,portion by gravity.

The primary and lsecondary cooling elements may be constructed as a unit by using the outer casing of the primary evaporator 15 as the upper inner shell 11 of the secondary element.

A convenient method to vassemble the primary and secondary elements is to leave a small space between the outer casing of the primary evaporator 15 and the upper inner shell l1 of the secondary element and fill in this space with some good heat-conducting material such as babbitt.

By fabricating the secondary evaporator as a separate element, porcelaining, and then securing to the primary evaporator by means of babbitt or other suitable heat conducting material, it is possible to treat the secondary evaporator as a seperate entit Thus for units to bo used in d iierent sized refrigerators, different sized secondary elements may be used with the same size primary element.- Furthermore, heating and resulting oxidation of the primary element is avoided which would occur if the secondary elewhen the evaporator is assem- 'I0 2 y l 1,912,458 ment were porcelained with the primary element and a secondary. cooling element comprising a in position. Fabrication of the secondary evapplurality of sheet metal plates welded together orator as a separate element also avoids dimat their edges and spaced apart by corrugations It will b e obviousl to those skilled in the art anda secondary cooling element comprising sheetl 85 in the drawings and described in the specicaplurality of freezing chambers below said primary 90 tion but only as indicated in the appended claims. element.

We claim: 6. A cooling element comprising, in combina- 1.A secondary cooling element comprising an tion, a` primary evaporator `having a horizontal tangular open end metal shell slightly .spaced comprising an open end metal shell spaced slight- 95 plate bent allmd Said Shells, the edges of said being welded together andthe edges of said sheetl shells and plate being welded together and said welded to said primary evaporator forming a lrectangular shells and' plate being pressed to narrow Huid tight space around and between said 10H11 a lld tight Space extending around each primary evaporator and said shell.

7. In combination, a secondary cooling element 3. A secondary cooling element comprising an space being filled with a good heat conducting open end tubular metal shell, av substantially, material,

rectangular open end metal `shell slightly spaced 8. In combination, a secondary cooling element tending around each and all of said shells. ROBERT s, TAYLOR,

4. In combination, a primary cooling element ROY A. HEIM. 130

I no

uid tight space around said shells. mem sneu and slightly spaced therefrom, the 

